Finding the Third Proportional to 12,900 and 19,854

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 19,854 = 19,854 : x
2. Step 2: Convert to fraction form
   12,900/19,854 = 19,854/x
3. Step 3: Cross multiply
   12,900x = 19,854 × 19,854
4. Step 4: Simplify right side
   12,900x = 394,181,316
5. Step 5: Solve for x
   x = 394,181,316/12,900
6. Step 6: Final answer
   x = 30,556.69